PROCEEDINGS FOR 1921 XXVII 



38. — The Gravitation Potential of an Anchor Ring. By Prof. 

 A. H. S, Gillson. Presented by Prof. James Harkness, F.R.S.C. 



39.— Some Tidal Problems. By Prof. A. H. S. Gillson. Pre- 

 sented by Prof. James Harkness, F.R.S.C. 



40.- — Law of Distribution of Particles in Colloidal Solutions. By 

 Prof. E. F. Burton, F.R.S.C, and Miss E. L. Bishop. 



41.- — Production of Heat during Charcoal Absorption. By 

 Stuart McLean, M.A. Presented by Prof. E. F. Burton, F.R.S.C. 



42.- — ^The Relation between Coagulative Power of Electrolytes 

 and Concentration of Colloidal Solutions. By Prof. E. F. Burton, 

 F.R.S.C, and Mr. E. D. Maclnnes. 



43— The Radial Velocities of 570 Stars. By J. S. Plaskett, 

 F.R.S.C. 



44. — The Orbit and Dimensions of TV Cassiopeise. By J. S. 

 Plaskett, F.R.S.C. 



45. — The Temperature Control of the Stellar Spectrograph. By 

 J. S. Plaskett, F.R.S.C. 



46. — The Orbital Elements of the Brighter Components of Boss 

 497. By W. E. Harper, M.A. Presented by J. S. Plaskett, F.R.S.C. 



47. — The Orbits of Spectroscopic Components of Boss 4622. By 

 W. E. Harper, M.A. Presented by J. S. Plaskett, F.R.S.C. 



48.^ — The Intensity Distribution in Tupical Stellar Spectra. By 

 H. H. Plaskett, B.A. Presented by J. S. Plaskett, F.R.S.C. 



49.— The solution of Plane Triangles by Nomographic Charts. 

 By S. D. Killam, Ph.D. Presented by Dr. Tory, F.R.S.C. 



50. — Note on the Geometrical Equivalence of certain Invariants. 

 By Charles T. Sullivan, Ph.D., F.R.S.C. 



5L— The Interpolation of breaks in Tide Curves for recording 

 Gauges. By W. Bell Dawson, M.A., D.Sc, F.R.S.C. (M.Inst.CE.). 



52. — The Vertical Movement of Alkali under Irrigation in heavy 

 clay soils. By Frank T. Shutt, D.Sc, F.R.S.C, and Alice H. Bur- 

 wash, B.A. 



53. — Notes on the Nature of Burn-outs. By Frank T. Shutt, 

 D.Sc, and Alice H. Burwash, B.A. 



54. — Reversible Pendulum. By H. F. Dawes. Presented by 

 J. Patterson, M.A., F.R.S.C. 



55. — Characteristic X Rays from Boron. By Professor A. L. 

 Hughes, B.A., D.Sc. Presented by Professor A. L. Clark, B.Sc, 

 Ph.D., F.R.S.C 



56. — A New Experiment in Vibration. By Professor John 

 Satterly, F.R.S.C 



